When riding the bike, oil used to get on the spark plug, causing the engine to turn off, and the mileage kept dropping down to 36/37. Therefore, upon the advice of an expert technician, a new carburetor was purchased and installed. Even after this, when the problem was not resolved, going to another mechanic, he said the problem is not in the carburetor, the problem is in the spark plug (the expert mechanic took the problem as a complex case right at the beginning and this is the situation!). And after changing the spark plug, it really got solved. The new carburetor cannot just be thrown away, so I kept that installed. Now I am willing to sell the original carburetor that came with the bike.